期刊
GEODERMA
卷 375, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.geoderma.2020.114496
关键词
In-field indicator; Soil carbon dynamics; Land management; Tropical conditions; POXC; SituResp (R)
类别
资金
- French National Research Agency (ANR) [ANR-14-CE03-0012]
- French Center of Agricultural Research for Development (CIRAD)
- LMI LUSES (Dynamic of Land Use Changes and Soil Ecosystem Services)
- HRPP (Hevea Research Platform in Partnership)
- French Institute for Natural Rubber (IFC)
- SIPH
- SOCFIN
- MICHELIN
- JEAI ECCO-RUBBER
- ACTAE project (Towards Agroecological Transition in South-East Asia)
- CANSEA Research Platform
- French Agency for Development (AFD)
- National Council for Sustainable Development
- Cambodia Climate Change Alliance -Phase 2 (European Union/Sweden/UNDP)
- United States Agency for International Development Feed the Future Innovation Labs for Collaborative Research on Sustainable Intensification (Kansas State University), Centre of Excellence on Sustainable Agricultural Intensification and Nutrition [AID-OAA-L-14-00006]
- PT-Smart
- CIRAD
- Labex Cemeb of Montpellier through the Equipe de Recherche Junior program
The assessment of the impacts of land-use and management on soil organic carbon (SOC) dynamics is a major environmental concern, as the soil carbon cycle underpins key ecosystem services. However, assessments based on short-term SOC dynamics face methodological and experimental difficulties. Hurisso et al. (2016) proposed a method to assess SOC dynamics by coupling two methods: Permanganate Oxidizable Carbon (POXC) and Basal Soil Respiration (BSR). This method has been used in laboratory on dried and re-wetted soil samples from temperate regions mainly. In our study, we adapted this method to the field and proposed a cost-effective in-field indicator combining the POXC and in situ Basal Soil Respiration (SituResp (R) method). We tested the indicator at four study sites (n = 169 points) within various tropical land-use and management contexts based on rubber, soybean and oil palm cropping systems respectively in Thailand, Cambodia and Indonesia. The results demonstrated the relevance, sensitivity and robustness of the POXC-SituResp (R) indicator to characterize the impact of a gradient of disturbance on SOC dynamics. The results also highlighted the potential of conservation agriculture (no-tillage and crops residues) and compost amendments to accumulate SOC. Rock-Eval (R) analysis showed that POXC-SituResp (R) indicator is negatively linked to excess of potentially mineralizable labile carbon. Carbon pools targeted by the POXC were specified by Rock-Eval (R) pyrolysis measurements to be a rather thermal resistant pool of SOC. Our study confirms that the integrated indicator based on POXC and BSR assess a relative carbon stabilization of SOC pools. This indicator can be measured in the field by a rapid and cost-effective method.
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